Body language is a form of communication. It is like a frown, folding your arms and looking down on someone. Without words, you can display very clear messages.
Body language can range from facial expressions, posture, hand movements, eye contact, etc...
The most obvious are the facial expressions. The more subtle are the body movements, like leaning away from someone who is talking to you, or looking at your watch when someone is teling oyu a problem they have.
I can go on and on, I took a course in Interpersonal Communication, which went over body language in detail, but i have to go out to work again.
If oyu have any specific questions, please feel free to post them and I will do my best to answer you!
Love, Dara